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Testing idling speed > < Wiring and component check with test box V.A.G 1598/22

A3 Mk1

Motronic Injection and Ignition System (4-cyl.)
Servicing Motronic injection system
Renewing engine control unit

Note:

When the engine control unit is disconnected the learned values are erased but the contents of the fault memory remain intact.

Removing

  • ‒ Switch off ignition.
  • ‒ Remove the windscreen wiper arms (screw connections) and take off the plenum chamber cover.

Note:

To remove the cover, first disconnect the hoses and plugs for the spray nozzles.
 
A23-0026
  • ‒ → Use a screwdriver to press lug on bracket to one side, then pull engine control unit towards the front of the vehicle to remove.
  • ‒ Release the plug holders and disconnect the control unit plugs.

Installing

Installation is performed in the reverse sequence.

Notes:

  • ◆ During the initial learning phase of the basic setting operation for the engine the idling may be slightly rough and the engine may pull a little unevenly.
  • ◆ After installing the engine control unit, carry out the following operations:
  • ‒ Coding the new engine control unit
  • ‒ Adapting the throttle valve control part -J338
    => Page 24-54
  • ‒ Adapting engine control unit to immobilizer control unit
    => Page 24-12

Adapting engine electronics control unit to electronic immobilizer

Test conditions

  • ● Authorized vehicle key required
  • ‒ Connect fault reader V.A.G 1551 or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3.
  • ‒ Switch on ignition.
  • ‒ Press key 1 for "Rapid data transfer".
  • ‒ Press keys 1 and 7 for address word "Dash panel insert" and confirm entry by pressing Q.
  • ‒ Press the ⇒key.
 
→ Indicated on display:
8L0919860.    AB-KOMBIINSTR.    VDO ...    ⇒
Coding XXXXX        WSC    12345
  • ‒ Press the ⇒key.
 
→ Indicated on display:
IMMO-IDENTNR: AUZXXXXXXXXXXX    ⇒
  • ‒ Press the ⇒key.
 
→ Indicated on display:
Rapid data transfer    HELP
Select function XX
  • ‒ Press keys 1 and 0 for function "Adaption" and confirm entry with Q key.
 
→ Indicated on display:
Adaption
Enter channel number XX
  • ‒ Press key 0 twice for "Channel number 0" and confirm entry with Q key.
 
→ Indicated on display:
Adaption    Q
Erase learned value?
  • ‒ Confirm input with Q key.
 
→ Indicated on display:
Adaption    ⇒
Learned value has been erased
  • ‒ Conclude adaption by pressing ⇒ key.

Note:

The identity of the engine control unit is read into the immobilizer control unit when next switching the ignition on.

Testing idling speed > < Wiring and component check with test box V.A.G 1598/22